Long crack growth rates for steam turbine steels are now quite well quantified for a range of environmental conditions relevant to steam turbine operation. However there has been little focused research to determine the kinetics of growth in the short crack regime i.e. crack depths typically less than 500 micron. To address this gap short crack growth rates have been measured on a turbine blade steel in simulated condensate environments under both constant load and trapezoidal load conditions (the latter to simulate repetitive start-up and shut-down associated with two-shifting). The results of these measurements will be reported and discussed and the implications for turbine blade lifetime prediction assessed. Stress corrosion corrosion fatigue short cracks steam turbine